#1B5183#1B5183

#1B5183 is a dark, moderate cyan. Relative luminance 0.078; OKLCH L 42.6% C 0.100 H 250.1°. Best body text is #FFFFFF at 8.23:1 contrast (WCAG AA passes).

Color values

HEX	#1B5183
RGB	rgb(27, 81, 131)
HSL	hsl(209, 66%, 31%)
HSV	hsv(209, 79%, 51%)
CMYK	cmyk(79.4%, 38.2%, 0%, 48.6%)
CIE-LAB	lab(33.47, 1.13, -33.07)
CIE-LCH	lch(33.47, 33.09, 271.96°)
OKLab	oklab(42.61% -0.0342 -0.0942)
OKLCH	oklch(42.61% 0.1 250.1)
XYZ	xyz(7.4896, 7.7557, 22.5706)
Luminance	0.0776 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B5183 #834D1B

analogous

#1B8381 #1B5183 #1B1D83

triadic

#1B5183 #831B51 #51831B

tetradic

#1B5183 #811B83 #834D1B #1D831B

square

#1B5183 #811B83 #834D1B #1D831B

split-complementary

#1B5183 #831B1D #83811B

monochromatic

#06121E #113250 #1B5183 #2570B6 #418FD8

Accessibility & contrast

On white

8.23

#1B5183 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.55

#1B5183 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B5183

8.23:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B5183	#FFFFFF	#000000	##FFFFFF
##1B5183	1.00	8.23	2.55	8.23
#FFFFFF	8.23	1.00	21.00	1.00
#000000	2.55	21.00	1.00	21.00
##FFFFFF	8.23	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3A5485

Deuteranopia (green-blind)

#2A4A82

Tritanopia (blue-blind)

#005D63

Achromatopsia (no color)

#4F4F4F

Design tokens & code

CSS

--color: #1b5183;
/* rgb */ color: rgb(27, 81, 131);
/* oklch */ color: oklch(42.6% 0.100 250.1);

Tailwind

colors: {
  custom: {
    50: '#6881a7',
    500: '#1b5183',
    950: '#000000',
  },
}

SCSS

$custom: #1b5183;
$custom-light: #6881a7;
$custom-dark: #000000;

JSON

{
  "hex": "#1b5183",
  "rgb": {
    "r": 27,
    "g": 81,
    "b": 131
  },
  "hsl": {
    "h": 208.846,
    "s": 65.823,
    "l": 30.98
  },
  "oklch": {
    "l": 0.42607,
    "c": 0.10024,
    "h": 250.1
  },
  "luminance": 0.07757
}

Semantic roles & 50–950 ramp

primary

#1B5183

secondary

#B67B43

accent

#913FE9

background

#F6F7FA

surface

#EBEEF4

border

#C6C9CE

text

#070A0F

muted

#7A7C7F

Preview Lab

Preview with #1B5183

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →